Commit Graph

346 Commits

Author SHA1 Message Date
scottr 54ea074777 Use option header file for MROUTING 1998-01-12 03:02:48 +00:00
scottr 3cdcd5e1c7 Use option header file for TCP_COMPAT_42 1998-01-12 03:00:42 +00:00
lukem c0e8ee54e9 * start from the top of the given ephemeral range and work down;
results in reserved ephemeral ports starting at the top (as per
  current practice), and shouldn't have a negative effect on normal
  ephemeral ports...
* initialise inpt_lastlow in in_pcbinit
1998-01-08 11:56:50 +00:00
lukem 1a63d90320 add missing ; ... 1998-01-08 00:32:39 +00:00
lukem c80b4400e5 add the following, derived from FreeBSD:
* IP_PORTRANGE socket option, which controls how the ephemeral ports
  are allocated. it takes the following settings:
	IP_PORTRANGE_DEFAULT	use anonportmin (49152) -> anonportmax (65535)
	IP_PORTRANGE_HIGH	as IP_PORTRANGE_DEFAULT (retained for FreeBSD
				compat reasons, where these are separate)
	IP_PORTRANGE_LOW	use 600 -> 1023. only works if uid==0.
* in_pcb flag INP_ANONPORT. set if port was allocated ephmerally
1998-01-07 22:51:22 +00:00
thorpej e5e283e02d Finishing merging 4.4BSD-Lite2 netinet. At this point, the only changes
left were SCCS IDs and Copyright dates.
1998-01-05 10:31:44 +00:00
lukem 1f8f74b669 enhance ephemeral port allocation code:
* support sysctl net.inet.ip.anonportmin (lowest ephemeral port)
  and net.inet.ip.anonportmax (highest ephemeral port).
  these can't be set to >65535, < IPPORT_RESERVED (unless IPNOPRIVPORTS
  is defined), and anonportmin has to be < anonportmax.
* use a cleaner way of only cycling through the available set once;
  this will be useful for when a random allocation scheme is used
* define IPPORT_ANON{MIN,MAX} instead of IPPORT_USER{LOW,HIGH}
1998-01-05 09:52:02 +00:00
thorpej 2e85747e9e From 4.4BSD-Lite2 (noted by Frank van der Linden):
so_linger is used as an argument to tsleep(), so was stuffed with
clockticks for the TCP linger time.  However, so_linger is set directly from
l_linger if the linger time is specified, and l_linger is seconds (although
this is not currently documented anywhere).  Fix this to set the TCP
linger time in seconds, and multiply so_linger by hz when tsleep() is
called to actually perform the linger.
1998-01-05 09:12:29 +00:00
thorpej 673fb149c6 Implement a queue for delayed ACK processing. This queue is used in
tcp_fasttimo() in lieu of scanning all open TCP connections.
1997-12-31 03:31:23 +00:00
lukem 0b57ba7265 as per the IANA assigned ports numbers document, use ports
49152..65535 for ephemeral ports (instead of 1024..5000).
closes my [kern/4440], but with correct code :)
1997-12-30 02:54:08 +00:00
thorpej 3c5ff3879d Keep stats on connections dropped due to excessive persist timeout. 1997-12-17 06:06:41 +00:00
thorpej 04ec3df592 From 4.4BSD-Lite2:
- When running the slow timers, skip PCBs in LISTEN state.
- When processing the persist timer, drop the connection if the connection
  idle time exceeds the maximum backoff for retransmit.  Part of
  kern/2335 (pete@daemon.net).
1997-12-17 06:04:17 +00:00
thorpej 82ce1f6a97 From 4.4BSD-Lite2:
- If we fail to allocate mbufs for the outgoing segment, free the header
  and abort.

From Stevens:
- Ensure the persist timer is running if the send window reaches zero.
  Part of the fix for kern/2335 (pete@daemon.net).
1997-12-17 05:59:32 +00:00
thorpej 154fe5a522 Add INADDR_ALLRTRS_GROUP and INADDR_MAX_LOCAL_GROUP. 1997-12-16 00:02:05 +00:00
thorpej ee84a26869 After further examination of traces of bulk transfers (with help from
Kevin Lahey), undo the "defer window update until next delayed ACK".
1997-12-13 21:02:38 +00:00
thorpej c02a72fcd0 Implement an infrastructure to allow larger initial congestion windows.
The sysctl'able variable "tcp_init_win", when set to 0, selects an
auto-tuning algorithm for selecting the initial window, based on transmit
segment size, per discussion in the IETF tcpimpl working group.

Default initial window is still 1 segment, but will soon become 2 segments,
per discussion in tcpimpl.
1997-12-11 22:47:24 +00:00
thorpej 3026b32ab3 In the PRU_RCVD entry point, if TF_DELACK is set, don't send the window
update now, since it will be sent within 200ms when the delayed ACK is
sent.  Instrument how many hits we get on this optimization.
1997-12-11 06:53:06 +00:00
thorpej 7f7bb7db17 In tcp_fasttimo(), don't clear TF_DELACK; we need it to count delayed ACKs
in tcp_output(), and it will only be cleared in tcp_output() if the ACK was
transmitted sucessfully.  Also, don't count delayed ACKs here, let tcp_output()
count them.
1997-12-11 06:42:44 +00:00
thorpej 8346cea65d Count delayed ACKs after they have been sucessfully transmitted. 1997-12-11 06:37:48 +00:00
thorpej 6c1840c05c Fix the "stretch ACK violation" bug documented in internet draft
draft-ietf-tcpimpl-prob-02.txt.  Also, fix another bug in the header
prediction case where an ACK would not be sent when it should be.
1997-12-11 06:33:29 +00:00
thorpej c40f4eb3cc Implement tcp_drain(). 1997-12-10 01:58:07 +00:00
thorpej eae709d885 Costmetic change: use intotcpcb() in tcp_fasttimo(). 1997-12-09 21:59:17 +00:00
darrenr 9fd3093f39 don't free pointer to static struct. please pullup. 1997-11-28 00:46:39 +00:00
mrg 3300e3e43e fix compile error when "options IPNOPROVPORTS" 1997-11-27 14:03:32 +00:00
mrg 2a9598ccdf fixes for memory leaks in proxying, and byte ordering problems. from darren reed. 1997-11-25 03:14:11 +00:00
thorpej 9f18d18071 Slight change to the previous: just drop the packet in the self-connect
case.  Sending an RST to ourselves is a little silly, considering that
we'll just attempt to remove a non-existent compressed state entry and
then drop the packet anyway.
1997-11-21 06:41:54 +00:00
thorpej ebd40d53e1 In tcp_input(), if the PCB we lookup for an incoming packet is a listen
socket:
- If we received a SYN,ACK, send an RST.
- If we received a SYN, and the connection attempt appears to come from
  itself, send an RST, since it cannot possibly be valid.
1997-11-21 06:18:30 +00:00
thorpej e2a99027d2 Add missing (implied) int to a variable declaration. 1997-11-20 19:12:41 +00:00
thorpej ad1ef53725 Deal with a problem where ephemeral port shortage would case a PCB's
local address to be set, causing all further attemps to bind that PCB
to fail.  From Koji Imada, PR #3857.
1997-11-20 04:53:37 +00:00
mrg fc911d1529 fix checksum problems (from marc boucher via darren reed). 1997-11-17 14:33:46 +00:00
mycroft 466fb6d0db On output, if the packet length doesn't match the length in the IP header,
drop the packet with EINVAL.
1997-11-16 20:58:18 +00:00
mrg 84ecff38c2 merge ip-filter 3.2.1 1997-11-14 12:40:06 +00:00
mrg 61cbfaca09 import ip-filter 3.2.1 1997-11-14 08:03:01 +00:00
kml 3b9fc85803 Remove an extraneous call to rtfree() in the path mtu discovery code;
this was causing negative reference counts on routes...
1997-11-11 21:10:50 +00:00
kml 86275dc497 TCP MSS fixes to provide cleaner slow-start and recovery. 1997-11-08 02:35:22 +00:00
gwr 011d063b25 Get rid of the messages: "arp: zero IP addr from ..."
If one really wants to know about those confused PCs
trying to use IP address zero, they can use tcpdump.
1997-10-31 02:54:08 +00:00
mrg 60c28e1f95 sigh. merge ipfilter 3.2 onto the trunk. merge to the branch was a mistake. 1997-10-30 16:08:54 +00:00
mrg 44c002beb1 import ip-filter 3.2 1997-10-30 05:27:24 +00:00
kml 560395f6f4 Changes to path MTU discovery to correctly handle "needs
fragmentation" ICMP messages that specify a new MTU size of zero
(from, say, old buggy Linux kernels).
1997-10-29 05:28:44 +00:00
kml c8e01708d1 remove extraneous icmp_do_mtudisc 1997-10-18 21:21:28 +00:00
kml 6b86b260cb change sysctl net.inet.icmp.mtudisc to net.inet.ip.mtudisc 1997-10-18 21:18:28 +00:00
kml 323c04642b Path MTU Discovery support. This is turned off by default.
Use sysctl -w net.inet.icmp.mtudisc=1 to turn on.
Still to come:  path removal after some period, black hole detection
1997-10-17 22:12:14 +00:00
thorpej 10f29f9bcb Allow `subnetsarelocal' to be changed via sysctl. 1997-10-17 21:20:49 +00:00
thorpej b174d20bc1 Define IP_RETURNMTU. (Matt missed this part of his diff, I guess :-) 1997-10-14 08:38:01 +00:00
matt 8c42ff649b Add support for returning maximum supported MTU when ip_output fails with
EMSGSIZE.
1997-10-14 00:52:39 +00:00
explorer 80513cb5ae o Make usage of /dev/random dependant on
pseudo-device   rnd                     # /dev/random and in-kernel generator
  in config files.

o Add declaration to all architectures.

o Clean up copyright message in rnd.c, rnd.h, and rndpool.c to include
  that this code is derived in part from Ted Tyso's linux code.
1997-10-13 00:46:08 +00:00
explorer 790e114732 Add hooks to use the kernel random system to generate TCP sequence numbers. 1997-10-10 01:51:07 +00:00
thorpej 67a3811e05 Fix an oversight in my previous MSS-related changes:
Basically, in silly window avoidance, don't use the raw MSS we advertised
to the peer.  What we really want here is the _expected_ size of received
segments, so we need to account for the path MTU (eventually; right now,
the interface MTU for "local" addresses and loopback or tcp_mssdflt for
non-local addresses).  Without this, silly window avoidance would never
kick in if we advertised a very large (e.g. ~64k) MSS to the peer.
1997-10-08 16:32:48 +00:00
is fabb33431c Reimplement a test for broadcast addresses advertized, which was left out
when rewriting the ARP system.
1997-10-02 19:41:56 +00:00
thorpej 4ed600dbd0 Fix several annoyances related to MSS handling in BSD TCP:
- Don't overload t_maxseg.  Previous behavior was to set it to the min
  of the peer's advertised MSS, our advertised MSS, and tcp_mssdflt
  (for non-local networks).  This breaks PMTU discovery running on
  either host.  Instead, remember the MSS we advertise, and use it
  as appropriate (in silly window avoidance).
- Per last bullet, split tcp_mss() into several functions for handling
  MSS (ours and peer's), and performing various tasks when a connection
  becomes ESTABLISHED.
- Introduce a new function, tcp_segsize(), which computes the max size
  for every segment transmitted in tcp_output().  This will eventually
  be used to hook in PMTU discovery.
1997-09-22 21:49:55 +00:00